Direction finding coil antenna



June 4, 1955. v A. LEIB I 2,003,375

DIRECTION FINDING COIL ANTENNA i e pr l 930, 2 Sheets-Sheetv 1 mvENToRAUGUST LHB F wzww ATTORNEY June 4, 1935.

A. LEIB I 2,003,375

DIRECTION FINDING COIL ANTENNA Filed April 25, 1950 2 Sheets-Sheet 2INVENTOR AUGUST LEIB Y ATTORNEY lists hei siB r fen n .ee n im- Bal orcoil aerial, recourse is usually had to ,a non.-

directional auxiliary antenna for the purpose off.

determining the sense of direction of the incoming signals. However,theuse of the latter is liable to be attended with undesirablecomplications in thatthe same-acts'likea body reflecting theelectromagnetic radiationsand this in'turn occasions a certain angulardisplacement or shift of the plane of the waves falling in thedirectional antenna.

It has beensuggested in the prior art to mount the auxiliary antennainthe axis of rotation of the direction-finding frame antenna (see, forexample, Keen, Wireless DirectionlFinding, secnd edition, page 113-,Fig. 106 and page 116, lines However, even in this 6 and from below).scheme mutual influences between the two antennae are not' entirelyprecluded inasmuch as then mutual electrostatic-actions occur on accountof the proximity of the two antennae.

Now, according to this disclosure. perfect -cooperation of thedirection-findingantenna and. the auxiliary antenna or'auxiliary antennalead disposed in the axis of rotation thereof is made possibleby thatfor the purpose of insuringprotection from mutual influences, a groundedmetal tube or'pipe, or some; similar metal protection :means, isprovidedb'etween the auxiliary antene na lead and the windings or leadsof the directional antenna; r

In. case the direction-finding antenna is en closed withinaweather-proof pipe, the latter could be used as the auxiliary antenna:or antenna lead. i Y

In order that also the lightning protection means may be arranged assymmetrically as feasible in relation to the directional antenna, it is"a particularly advantageous scheme to employ the said weather-proof pipeas one pole of the lightning protection device; The invention will bebetter understood by reference to the drawings throughout which likereference numerals indicate. like parts and in which,

Figure l shows a wiring diagram of the antenna arrangement according tothis invention; Figure 2 showsin elevation, the weather-proof :frameaerial, the vertical aerial associatedtherewith, a static electricityprotection device, the

. mountingfor the frame aerial, a receiver and the shield enclosing theleads from the frame aerial to the receiver; 1 v Figure" 2a. shows across section taken along the line A, B01?v Figure 2,662,375 fircrioerirmafl a NT l Ge rm ahy, assignor to Tele- T V aft fur DrahtloseTelegraphic ,j eermaey ai corporation of inseama al es a, saaim aem Inrm ny' ne 8,2132 V 3 Claims. crest- 1 in direction-finding workby theaid of a frame ftectorjpipe of the directional-aerial.

Figure 2b showsa cross section taken along the lines C,'D of Figure 2;

Figure 3 shows in prospective an application of "the present invention;while,

Figure'3ct shows a modification of the arrangement shown in Figure 3. 7

Fig. l of the drawings shows a fundamental key diagram. of thearrangement according to this invention. Referring to the'drawings,;ade-" notes -the auxiliary antenna which is neutralized (uncoupled) inrelation to the supply leads I, .2, 3, l, of the coil aerial by means ofa grounded metalprotectionmeans E. The coil aerial consistsjfo rinstanceof two coil windings RI and R2 which may be. connected in seriesor in parallel according to requirements Fig. 2 shows an elevation ofthe arrangement according to this invention in combination with aweather-proof direction-finding antenna, the weather-proof pipe of whichat the same time device. 11 here denotes the weather-proof pro- Theposi-. tion of the winding of the directional antenna in- 'sidesaidjprotective pipe is shown by way of ex-- ample for the section AB inLFig.2a.

0 denotes the shaft pipeassembled together with the frame ring a bymeans of a holding'clip. b. The position of the leads inside said shaftis shown,

for instance, Fig..2b for the section CD. The numerals l-6 here refer tothe, key diagram Fig. 1. d is the coupler fork of the hand wheel securedupon the shaft by theraid of a clip. e denotes the drive of thedirectional aerial comprising hand-wheel and goniometer scale or dial.

f is a flexiblemetal protection means the cross:

serves as one pole of the lightning protection section of which'is thesame as shown in Fig. 2a.; j

g is a coupler plug uniting all of the leads 1-43 shown in thekeydiagram, i is the direction-finder receiver with which the directionfinding or auxiliary antenna may-be connected by .insert- 7 ing the plugg in the receptacle bushes disposed in the plate 1'. 7c is theauxiliary-antenna lead. It may be identical with the auxiliary antenna Awhen the latter constitutes a simple linear structure (see Fig; 3), orelse it may serve asthe lead brought to the auxiliary antennaconsisting, for instance, of two diagonal wires Al, A2,

and being disposed in horizontal sense (Fig. 3).

Z is an auxiliary fixture for connecting the aux-.

iliary antenna and for clamping the insulator piece pofthe frame ring, mdenotes the'connect- ,ing lead be'tween Z and the lead of the auxiliaryantenna accommodated inside the pipe shaft '0.

are the lightning protection horns adapted to conduct a lightning strokethat has struck the antenna from the frame to earth.

As can be seen from Fig. 2b, the lead 5 of the auxiliary antenna isdisposed inside a ground metal protector sheath 6 so that it isperfectly screened from the adjacent leads |4 of the directionalantenna.

I claim: I 7,

1. In a directional aerial system the combination, of a frame aerial, aconducting closure member therefor, a vertical aerial supported by saidclosure member symmetrically with respect to said frame aerial,electrical disturbance pro- ,tective means cooperating with saidvertical aerial and said closure member to protect said vertical aerialfrom electrical disturbances and a receiver adapted to be connected tosaid aerial system.

2. In a directional aerial system the combination, of a frame aerial, aconducting closure vertical aerial connection.

3. A direction'finding system including a rotatable frame aerial,shielding means therefor, a vertical aerial mounted on saidframe aerial,an electrical disturbancedissipating means mounted 'on'saidframe aerialadjacent said vertical aerial,

a receiver, means for connecting said frame aerial to said receiver, anda symmetrical conmotion between said vertical aerial and said receiver.

AUGUST LEIB.

